Bumper mechanism



4 Sheets-Sheet l ame/whoa EFOHLBVDORF May 12, 1931. E. F. OHLENDORF' BUMPER MECHANISM Filed March 26, 1930 y 2, 1931. I E. F. OHLENDORF l'805'414 BUMPER MECHANISM Filed March 26, 19s0 4 sneets -sheet 2 Fig. 6.

I I 2 l3 ,2 II 9 avwmmtoaa I E F OHLENDORF y 1931. E F. OHLENDORF 1,805,414

BUMPER MECHANISM Filed Marbh 26, 1950 i 4 Sheets-Sheet a 5/? CH4 ENDO/PF I (WW/amp y 1931. E. F. OHLENDORF 1 BUMPER ME CHANI SM Filed March 26, 1930 4 Sheets-Sheet 4 H 7IIIIIIIZII1 3 no cutoz 5 E OHLE'NaOIPr 2- Patented v I f F-BF- C 7 V invention relates teahumper for i ehi Qofthe. head and one (if the hlochs coaeting cles and particularly'tdthe type designed for therewith; showing the roller at the limit of f mechanically plfQp'filled vehiele's usingatrans- "its mpyementjn an opposite direction to the iv Wisely disposed prin ar'wh c 'y eld u p s nfshqwn i i-Figures).

3 5 glen impafitkandrautemgtieai'ly asjsumeshor- ZFigII I G l2-isjfa plaii viewofthe frietien firm 55 i i 10 give -bumperta muchhig e mp la 9 zmalapo'sitionv fi h w fl 'T ow impertent feature f the invention 15 'locatiofn andthe .OllfliIlGOfJihB gI'OOVQS-fOI the --provision 'ojf ieqnneetiens :betvye'enjthe the steelfb'alls;

bumper and Vehicle 'wheifeby itis pessibl'e to" Figiii ei 13 is a seetienelax iew en theline is newpneeticable,whereby zthe resistzunc ze- Fig rel i shewg a'plan'view oithe-frictien;

I pfiered' gn the returnmeveme tfby:the 9,6111: blockgutilizing it" rubberitnfd fabric compost V hectipns willheslightly lessthan-the energy tipn forming the vfrie'tidnf surface. ItTalso stored up in "the bumper {hers so that the-qhews thematingtgrooves forfthe steelballs,

' f lgtter will autgmatieally returnithe parts to; i'FigHieJS showed-pivot eofnnecti'onforthe normal PQ tiOIland the meyits th'ereOf refe ence is -to be had 'fFig'hi'e 16jis'a sfitionatl'view the Ema-5 f v to the qmpalgyi g d gs and 9 -l Q ig e 1 w description "iflwhieh corresponding embodiment theinyelition i1h1s- 7 f r zsflu strativeof an embodiment of the inyeiitioh, thetmemher 1' eempfises 'c ompani'on' bars and Tlikepitrts are designated bylsimilar ref-F "tl ef ,"the bumperinelildes' members or bars eren echaract sf 1 and-2, ntie t e fi'bii p In. h e gmpan fng d wi gs:

fe'enneeting the' brace 3' with the membetl;

the detted lines lirll di gatillg'thepesitiqn Ofthe whieh 'alje grippedbetween two parts: The

parts when an end of thefhump'er yields un-" br-ce geon'sists ofa single'har and iselampedf' v V iderimpagct. v j V f z titsendeja dat enfiddle point'to thebars 1.

' Eigure Z is an enlarged detail viewfQf a'jT-he middle elamp'inelfldes a'body 4, plate 5,-

; -eo resistan ce connectionbetween the freint;Lend" find rconncting bolt 5a. The brace 3 is 80 li e 9 Fig i E3a 'I' e of the members of. th ip" resistance, the

TFigureffi is a view similar F i "7 Figure? is a"detalilseetie elflew felagmped between arms of the body 4 by means I i 154d; Theend-chimpsoompriseplates I 7 'ibolt 26a: iiTheibars 1 are'clampedqpl ate 6., 6b jafidthe bolt 6a passesn a bars c mpx in-gifih umpe 1 1 :indi ate ibyifih 'e r 1 9 8 e i w it e Figure 4: ede'tail sect ona y w onth wh ught e @1 3, e d-ME t aga nst b11635 @6 1 and we (16 e stance units are inf n I esignatedlgenerally bythe 'numeraEJlIQmIflQ: Ingthemodi, i medifieation. j e v V. I shew-11inFigureefijehd'floneTesist-v i -Figure 7 is a jsec tional View. onphel in it i'swm pleyed andj sdesignatedigenv I y the humerall'l; The twin iesistits' i contemplete aishank'lO forked at dendrprovidedfitiite opposite endrwithi t he; 20 0f ei'x e ilaioutlin'evand forlfnelin"v U i Figilrefi'isa detailfpersbective bile in i'mi effigmfe fif f v e Y Figu efi isfan enlanged sect onal y ew ef -45 i116 line 8+8ofFigure LI of the member 10. The plates 22 are similar I i when assembled',beingdisposedwiththeirholthe head are staggered. Theedges of the blocks 19 are beveled, as indicated most clearly in Figure 3 ofthe drawings, tomatch that portion of the plates 22 disposed at the sides andeach has opposite ends of circular outline and pressed outwardly 1n the same dlrectlon to form concavo-convex elements, said plates,

low or concave sides facing, as indicated most clearly in Figure 3 of the drawings The head20, and blocks 19 at the sides thereof are received between the concavo-convex portions '11 of the plates 22 and are connected by means .of the bolt 11a. A block 13 isreceived between the concavo convex portions12 of the plates22 and is held in place by a bolt 12a passingthrough the parts 12 and 13; Op-

e-posite faces of the block 13 are beveled to cor-,

respond with the outline ofthe concave faces of-the elements '12. A non-circularor square formed upon the. adjacent element 23 and, in

. this -manner,,the block 13 is prevented from turning. The socket l l'preferably forms part of the element 23 which consists of a bracket secured to the bar 2 or direct to a bracket 8 on the car frame horn.

The singleresistance unit 17i1lustratedin I Figures 6 and,7,c0nsists of two pairs of plates 25 and 26 which are formed at one end for attachmentto thebars 2 and 3 or have-one end pivoting in an eye on the bracket 8, and

- which have their opposite ends of circular I 7 formation and pressed laterally into concavo-cOnvcx form and interfitted and con .nected by means of a bolt 16, as shown most clearly in Figure '7. v The. frictional engagement of the circular ends may be regulated by tightening the connecting bolt 16 more or less,

in contact reacting upon the bumper to retard.

. thus stored reacts I I as'will be readily appreciated. The; parts 2 ,full lines in -Figure Land when the bumper, y elds undercontact the parts assume'flthe .position indicated by dotted lines in saidfigure, both members comprising the unit rotatnormally occupy the position indicatedby ing and the resistance between the surfaces its movement, both in yielding under impact that one thousand pounds stress will be required to move the bumper bars backward without any resistance of the units. The resistance units can be set to sustain a force of eight hundred pounds. The difference of two hundred pounds would be sufiicient to return the bumper to normal position. It will thus be-understood that about eighty per cent is absorbed to prevent a dangerous rebound. 'As indicated most clearly in Figure 1 of the drawings, the resistance units are mounted away from the wheels and the joints are such as to prevent rattle. The elements comprising' the units may be stamped from sheet metalof suitable gauge towithstand the ,rearbumper member or'to an eye provided on the frame offthe chassis and formed with ;the born 8 attached to the side frame bar 7 As shown most clearly in Figure 5, the roller receiving grooves19b and 20b graduallywiden from the center outwardly. The

I shoulders at the sides of the grooves are ab- 'proj'ection13a is formed upon a side of the -block13 and is, accommodated in a socket 14 rupt, as indicated in Figures 9 and 1 1, and

'formstops to limit the movements of the r011 .ers ineach direction. Figure 9 shows the normal position of the rollers 21. When the bumper is forced back, the head 20 rotates in the direction of the arrow, inFigures 9 and 11 and the rollers move in the grooves 19?) and 20b untilthey reach theabrupt walls at one side of the grooves, as indicated in verse takesplace. Before there is any movement of the blocks 19 with the head 20, the

, rollers move .to the opposite side, of the grooves. This reduces the friction between the elements .19, and 11 and, in consequence, the resistance on the rebound is less than the resistance ofi'eredwhenithe bumper isforced back by impact with. an object.

utilizes steel balls 27 ineplace of rollers. A single friction block 29 is used, the lower part of the plate 20 forming} the frictional contact with the plates 26. Thebottoms of the slots 20?) are inclined, thus'functioning in the same way as the grooves 20b,'Figure 5.

These grooves for the steel balls are also shown by Figure 12.. Thezfrictionblock has corresponding grooves as shown by 196, Fig- "ure 14. '2 These grooves are formed ina circular steel plate 28, to which a rubber and fabric composition 29 isvulcanized or otherconfining theballs as compared to rollers.

When the trussbar 3 Figurel' is to be dis:

The modification as shown byjFigure 13;

wise fastened, Thisfstructure as shown by igure 13 produces a simplified means of pensed with, a modified pivo t'connectionv tor the resistance unit is shown "by; Figure A single pivot block having anextendedised;

30, thus making a'pivot mounting for there "8181331106 unit. This s more clearlyshown,

" ig'sfbws tion to 'formaiclamping surface for theibolt plates 26 and the'hinge' section of the clamp by the sectional drawing Figurem.

,1. In bumper mechanism, airota'ry,friction; unit comprising a member having ahead the sides of whichare-goutwardly convex in r; every direction,a companion niember com r V1 hat isclair'ned is;

prising concavo-convex elements embracing the converging sides of the first 'mentioned" member, and a pivotconnection betweenthe coactingelements to' maintain frictional en gagement between the parts}; I 2o 1 2. In'bumper mechanism, a resistance unit comprising plates having opposite end pore-, tions of approximately concavo-convexform: and disposed with its hollow or concave sides facing inwardly,and elements of cor-I responding shape gripped betweenrthe concave sides of the end portions of the first mentioned member;

v head, rollersbetween the a head and blocks 7 and disposed in 'mating' ljradial; inclinedlr-p grooves formedthere'm, plates having oppo- L7 '7 site end portions of concavesconvexgiformas tion, the said headand.blocksbeingreceived .end portions of the plates,'meansTfor pre i 3; In bumper mechanism, a member pros vided with a head of approximatelycircular outline, blocks at the sides of .thefhead, and

links, said linkspivotingin ,saidbrackets f I lgln aflbumper mechanism, resistance unit, including a member having'a' head of; Ecir'cular outline, grooves" having inclined a -member comprising spaced concave-convex elements hav n V blocks disposed therebetween. a, I

4:. In bumper mechanlsm, a memberkhav-g ing a head of approximatelycircular outline, blocksz'at. the sides of theqhead',rotary; elements between, the head and blocka es member including spacedzelements of con-i I p v -unitincludinga friction member having a t 1 head otcircular outline, ablock; at'the side of thehead, balls disposedininclined grooves formed in the head,-mating grooves in the block, plates having end portions" of con; cavo-convexformation, an extension on the 3 cavo-convex form and having the said head and blocks therebetween, and a-pivot'co'nnec- 'tion between'the sever'al'parts. t I I 5. In bumper mechanism, afrotary fric-i- ,tion unit comprising lcomplem ental plates formed with econcavo-convex portions,

block therebetween and held from rotation,

and a pivot connection betweenthe block and."

concave-convex portion. v 5 v a 6. Inbumper mechanism, a resistance} unit lncludlngmemberhaving 1a head of;

circular outline, block's-at the sides "of the between corresponding end portions bfthe plates, a block 'disposedbetweenthe opposite venting rotation of thfe' block, and adjustable pivot :tasteningsconnectingthe several-parts' whereby to regulatethe frictional contact oi the engaging surfaces;

7. In av bumper mechanism, a resistance unit mounted on therear bumper bar,{ nd pivotally connected to the frontbumper barb is used. The bolt 9 passeslthrough the b'ars, a 1 rear framehornfclamps and forming a1reye,and resistance.unitlinkspivoting insaid eye, ,lOIIn afbumper mechanism, atrussban "@curved b'ack'at its center, its ends each tearminatingin an eye and resistance un'itilinks I pivoting in said eyes, and clamps supporting f g the said head; and j Vance unit offering;

.;.mounted between the front and rear bum er,

1y connected-tothe front bumper bar. j w 7 .1 In test monywhereof I afiixmy signature; smu r. jQHL D a 11 I I,

I 8. In :a {bumper mechanism, a resistance unit pivotallye mounted on the rear bumper barf,and pivotally connected to the front bumper barg 1 bumper bar terminating at the said truss bar-at its center and ends.

.9; In a'bumpeiimechanism, front' bumper r 11. Ina bumper mechanism'front and rear 7 ebump'erbars, atruss,barsupportingthefront 6 e {bumper bars andfa clamp-holding said truss V bar, saidfjclamp consisting; of ani upper and low erlip, afltie section connecting the two lips, f 6 I e'b tq em h upp nd :1 P a if [clamping plateanda second bolt. clamping 4, 5; ihe frontsection of the clamp to front bumper amp, A v V "12.In a bumper mechanism a resistance? imithaving a resistanceblockconsistingofra and a fibrous compoundvu-lcanized or other- V- I awlse fastened tosaid base;

steel base having groovesto receive'steel balls 7 bumper banana resistance units having bases-formedjon one face and a convex :Erici" tended-section-toform a pivot connection; j

13. In a bumper mechanism front and ibumperb'ars,brackets clampedto the front]? 1 tion surface on the opposite -face and ex- 15! In a bumper? mechanism a resistance friction circular membertoform a pivot arm, a supporting strap, and an adjustablepivot ofthe engaging; surfaces; 2

p Q16; In ag ibumpermechanism, the combina-ji ct on .of front 'andir'earbumper bars, ares-istdirectiomisaid resistance unit beingf 'pivotally bars unit consisting'of companion sections pivoted to each other,; one section'being. pivotally" ,e 125 mountedon the vehicleand the other pivotals ;fasteningtq-.regulate theifrictional contacti I I I A v 4 5 i greater resistancenwhen '1 M rotated in one ,ClIIGCtIOIltllflIl inthe'reverse v a f 'I'Z QIn-a buniper meehan sm the .combina- 1- tion o asfront bu1nper"bar, ,.an d a resistant; v 

